Cam control for valves of internal-combustion engines.



E. HERKT.

CAM CONTROL FOR VALVES OF INTERNAL COMBUSTION ENGINES.

APPLICATION FILED NOV. 11, 1912.

1364,183. Patented Dec.14,1915.

tdlhfid PATEN GFFTQE ERNST HERKT, 0F KIEL, GERMANY, ASSIGNOR T0 FRIED. KRUPP AKTIENGESELL- SCHAFT GERMANIAWERFT, 0F KIELGAARDEN, GERMANY.

Specification of Letters Patent.

PatentedDec. 14:, 1915.

Application filed November 11, 1912. Serial no. 730,736.

To all whom it may concern:

Be it known that I, ERNST HERK'I', a citizen of the German Empire, residing at Kiel, Germany, have invented certain new and useful Improvements in Cam Controls for Valves of lnternalCombustion Engines, of which the following is a specification.

The opening of the valves of internal combustion engines is usually accomplished through a cam shaft acting through the medium of a controlling lever and driven by the crank shaft, while the closing of the valves, in most instances, is effected by springs. Should binding occur from any cause, in a valve controlled in such a manner, it may happen that the force of the valve-spring is not sutlicient to overcome the hind ance and again close the valve. Such an arrest of the valve will in every case result in disturbing the operation of the engine and may, when, for example, it occurs with the pressure air inlet valve, lead to serious injury of the cylinder. That is' to say, if an inlet valve opening toward the interiorof the cylinder should, in consequence of binding, remain open too long, too much pressure air will flow into the cylinder. At the upward movement of the piston, the

valve will be forced closed by the pressure of compression overcoming the resistance,

with consequent raising of the pressure ofcompressionwhich may result in fracture of the cylinder.

The object of the present invention is to avoid this evil.

In the accompanying drawings. the subject matter of the invention is shown by way of example, in two embodiments, in use in connection with the pressure air inlet valve.

Figure 1 shows a side view of. the controlling mcans, together with a section through the valve mounting; and Fig. '2 is a similar view of a somewhat different embodiment of .the controlling means.

Referring first to the embodiment illustrated in Fig. 1, A designates the controlling shaft, B the intake cam disk with the controlling cam 6 C the controlling lever, which is swingingly mounted upon the axis 1), and carries the controlling roller 0 A draw-rod E and an angle lever G, G serve to transmit the movement of the controlling lever C to the spindle J of the intake valve, which is provided with known equipment.

According to the present invention there iliary lever K K lies just outside of the path of the earn 6. The method of operation of this arrangement is as follows :-If the cam disk B is rotated in the direction of the indicated arrow 00, the earn 6 impinges against the roller 0 of the controlling lever C and imparts to it a turning movement through which the valve, by means of the connections E, G, G, .will be opened. In this turning movement the auxiliary lever K will be carried with the controlling lever C, through the medium of the abutment M and in the same direction and through the same angle, so :hat the controlling roller of the auxiliary lever will arrive in the path of the cam 6 roller 0 has pajssed beyond the cam 6 the valve closes automatically under the pressure of the valve spring, the connections G, G, E and the controlling lever C return as also does the auxiliary lever K, K to their original positions. The cam b then passes over the controlling roller L of the auxiliary lever, without exerting any effect upon it. If, however, the valve, for any reason should remain open, the cam Z), in the further turning of the controller shaft A, impinges against the controlling roller c and thereby rotates the auxiliary lever K, K back to its starting position. -But disk has a recess r corresponding to the eleend projecting into the path of vation of the controlling cam N, with which the controlling roller 70 of the auxiliary lever, cooperates when the valve is opened,

- axis D, is transmitted through the medium of a two-armed intermediate lever G, G, to the valve spindle J.

The opening of the intake valve is caused, as in the first described illustrative embodiment, by the cam disk B and the levers C and G, G, as soon as the controlling roller 0 runs upon the cam 12 The auxiliary controlling lever K, K is hereby swung through the arm G of the intermediate lever C, and the controlling roller 70 enters the recess 1 of the auxiliary cam disk If now the valve, in consequence of a binding, should remain open, the roller in, after a further rotation of the shaft A, in the direction of the arrow a: again runs upon the full rim offlthe auxiliary cam disk' R and thereby forcibly directs the auxiliary controlling lever K, K

the lever C and the valve spindle J, back to the closing position.

I claim 1. A cam control for the normally closed valve of an internal combustion engine comprising a cam, an auxiliary controlling lever partaking of themovement of the' nain controlling lever and having an end which enters the path of the cam when the valve remains open and is moved by said cam and caused to close the valve.

2. A cam control for the normally closed valve of an internal combustion engine comprising a cam shaft, a main controlling lever actuated by said cam shaft and an auxiliary controlling lever partaking of the movement of the main controlling lever and having an a cam on the cam shaft when the valve is open, but mova main controlling lever, and

ing out of the path of the cam when the valve is closed.

3. In combination with the normally closed valve of an internal combustion engin e,'a main controlling lever,'connections through which said main controlling lever is adapted to move the valve in the closing as well as the opening direction.

4. A valve control having a rocking lever engaging the valve spindle, said spindle tending to close the valve; a bell crank lever, positive connections between said two levers, a revolving cam constructed to contact with the free arm of said bell crank lever actuating it to open the valve, and means for continually holding said free arm in contact with said cam, said means comprising an auxiliary lever positively connected v. ith said bell crank lever and projecting into the path of said cam while the valve stands open; said auxiliary and bell crank levers cooperating for positively opening and closing the valve.

5. A valve control having a rocking lever engaging the valve spindle, said spindle tending to close the valve; a bell crank lever. positive connections between said two levers, a revolving cam constriwted to contact with the free arm of said bell crank lever actuat ing it to open the valve, a trailing arm having positive connection with said bell crank lever and constructed to be actuated by said cam to compel the bell crank to close the valve and means for adjusting the relative angular position between said bell crank and said trailing arm, said trailing arm and said cam cooperating to hold the free arm of the bell crank lever continuously in contact with said cam, causing positive opening and closing of the valve.

In testimony whereof I have affixed my signature in presence of two Witnesses.

ERNST HERKT.

Witnesses:

JULIUS RoJsKu,

F Max KAHVA. 

